351w upgrade
Postmaster
Joined: Jan 2009
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What do you want out off the truck ? If the dooe heads have the 60cc chambers that will help your compression ratio , i asume they have stud mount rockers , do they have the air pump holes in the back of the heads ??? ...Lew
Postmaster
Joined: Mar 2005
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From: Earth
If those heads use the stock rail rockers - i.e. not machined for studs and guideplates - you shouldn't run a cam with more than ~.45" of lift. I saw a pair hold up with one of those old Edelbrock Performer cams.
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Junior User
Joined: Nov 2009
Posts: 78
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this is what i was told to get
COMP Cams K35-238-3 - COMP Cams Xtreme Energy Cam and Lifter Kits - Overview - SummitRacing.com
COMP Cams K35-238-3 - COMP Cams Xtreme Energy Cam and Lifter Kits - Overview - SummitRacing.com
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Junior User
Joined: Nov 2009
Posts: 78
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im not to educated on the whole engine overhaul, im just going on what i was told, i bought the heads offline and they are in very nice shape, or so i think, and i was told to get that package to get the most out of my 351w, im just looking to make my truck nice and fast, nothing ridiculous or anything, just a nice pro-street truck. hopefully im going in the right direction, its a 77 f100 with a 84 351w according to the casting id, and it has a c6 transmission and on the drive shaft it says 1981 f150
Postmaster
Joined: Mar 2005
Posts: 2,949
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From: Earth
Here's the deal, those heads use rail rocker arms - they've got little ears on either side of the valve stem to keep them aligned. If you run a high lift cam - and the one you're looking at there is .5" - those ears can ding the retainers and pop loose the locks...which means a dropped valve and the end of your driving fun for the day.
You could get away with a smaller cam, maybe this one COMP Cams K35-230-3 - COMP Cams Xtreme Energy Cam and Lifter Kits - Overview - SummitRacing.com It's a good truck cam, I got one for my 351, lots of torque and will rev out to ~5,000.
You could get away with a smaller cam, maybe this one COMP Cams K35-230-3 - COMP Cams Xtreme Energy Cam and Lifter Kits - Overview - SummitRacing.com It's a good truck cam, I got one for my 351, lots of torque and will rev out to ~5,000.
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Junior User
Joined: Nov 2009
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heres some pics of the heads
http://i475.photobucket.com/albums/r...etta/005-1.jpg
http://i475.photobucket.com/albums/r...etta/006-1.jpg
http://i475.photobucket.com/albums/r...njetta/007.jpg
http://i475.photobucket.com/albums/r...etta/008-1.jpg
http://i475.photobucket.com/albums/r...njetta/009.jpg
http://i475.photobucket.com/albums/r...njetta/010.jpg
http://i475.photobucket.com/albums/r...njetta/011.jpg
http://i475.photobucket.com/albums/r...etta/013-1.jpg
http://i475.photobucket.com/albums/r...njetta/014.jpg
http://i475.photobucket.com/albums/r...njetta/015.jpg
http://i475.photobucket.com/albums/r...njetta/016.jpg
sorry i know its a lot of pictures, but im not to sure on what exactly what you guys look for
http://i475.photobucket.com/albums/r...etta/005-1.jpg
http://i475.photobucket.com/albums/r...etta/006-1.jpg
http://i475.photobucket.com/albums/r...njetta/007.jpg
http://i475.photobucket.com/albums/r...etta/008-1.jpg
http://i475.photobucket.com/albums/r...njetta/009.jpg
http://i475.photobucket.com/albums/r...njetta/010.jpg
http://i475.photobucket.com/albums/r...njetta/011.jpg
http://i475.photobucket.com/albums/r...etta/013-1.jpg
http://i475.photobucket.com/albums/r...njetta/014.jpg
http://i475.photobucket.com/albums/r...njetta/015.jpg
http://i475.photobucket.com/albums/r...njetta/016.jpg
sorry i know its a lot of pictures, but im not to sure on what exactly what you guys look for
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Postmaster
Joined: Mar 2005
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From: Earth
Option B is to have them machined for screw-in studs and guideplates and get some hardened pushrods. Then you can run just about any cam you want. But that XE250 cam will make you pretty happy with those heads.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
The heads have studs so you can use whatever rockers you want and I'd also suggest a modern roller rocker utilizing guide plates and hardened pushrods as Baron did. I don't see the XE262H being an issue as any spring set you buy will support 1/2" lift including those in the kit and this cam will deliver the broadest powerband(most TQ and HP) with a 351.. though the XE250H isn't a horrible second choice but will come up a little short on the top end.
Postmaster
Joined: Mar 2005
Posts: 2,949
Likes: 6
From: Earth
Comp makes some stamped roller tip rail rockers that might be worth checking out too. COMP Cams 1431-16 - COMP Cams Magnum Steel Roller Tip Rocker Arms - Overview - SummitRacing.com
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